Abstracts contains the abstracts of work presented at the 7th International Congress of Pharmacology: invited lectures, symposia, methodological seminars, and free communications. The abstracts are organized in chronological order of presentation at the Congress. Some abstracts focus on chemistry and biochemistry of pituitary endorphins and their precursors; the biosynthesis and release of the enkephalins; enkephalin dynamics and neuronal localization; and physiological and pathophysiological relevance of the opiate receptors and their endogenous ligands. Other papers center on the mechanism of muscarinic receptor action; regulation of cholinergic receptor metabolism in skeletal muscle; the role of vitamin E in ozone-induced pulmonary toxicity; alcohol and electrophysiology of the central nervous system; and pharmacokinetic aspects of drug-alcohol interaction.